#include <iostream>
using namespace std;


int main()
{   
    int a = 100;
    /* 垃圾专用关键字 */
    auto num = 666;

    cout << "num:" << num << endl;

    auto str = "hello world";
    cout << "str:" << str << endl;
    
    auto * pNum = &a;
    cout << "*pNum" << *pNum << endl;


    int a = 10;
    decltype(a) b = 20;

    string str = "hello";
    decltype(str) ptr = "hello world";
    cout << "ptr:" << ptr << endl;


    return 0;
}